<!DOCTYPE html>
<html lang="en-US">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>area_center_xld [HALCON算子参考手册]</title>
<style type="text/css">
      body {
    color: #000000;
    background-color: #ffffff;
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
}

.body_main {
    margin-left: 35px;
    margin-right: 35px;
}

@media screen and (min-width:992px) {

    .body_main {
        margin-left: 10%;
        margin-right: 10%;
    }

    table.toctable {
        width: 80%
    }
}

@media screen and (min-width:1400px) {

    .body_main {
        margin-left: 15%;
        margin-right: 15%;
    }

    table.toctable {
        width: 70%
    }
}

body>div ul ul {
    margin-left: inherit;
}

a:link {
    color: #0044cc;
}

a:link,
a:visited {
    text-decoration: none;
}

a:link:hover,
a:visited:hover {
    text-decoration: underline;
}

th {
    text-align: left;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    text-rendering: optimizeLegibility;
    color: #666666;
}

code {
    font-family: monospace,monospace;
}

h1 a.halconoperator {
    font-family: Arial, Helvetica, sans-serif;
    color: #666666;
}

h2 a.halconoperator {
    font-family: Arial, Helvetica, sans-serif;
    color: #666666;
}

hr {
    border: 0;
    border-top: solid 1px #f28d26;
}

.pre {
    display: block;
    padding-bottom: 1ex;
    font-family: monospace;
    white-space: pre;
}

pre {
    font-family: monospace, monospace;
    padding: 1ex;
    white-space: pre-wrap;
}

.toc {
    font-size: 80%;
    border-top: 1px dashed #f28d26;
    border-bottom: 1px dashed #f28d26;
    padding-top: 5px;
    padding-bottom: 5px;
}

.inv {
    margin: 0;
    border: 0;
    padding: 0;
}

.banner {
    color: #666666;
    padding-left: 1em;
}

.logo {
    background-color: white;
}

.keyboard {
    font-size: 80%;
    padding-left: 3px;
    padding-right: 3px;
    border-radius: 5px;
    border-width: 1px;
    border-style: solid;
    border-color: #f28d26;
    background-color: #f3f3f3;
}

.warning {
    margin-top: 2ex;
    margin-bottom: 1ex;
    padding: 10px;
    text-align: center;
    border: 1px solid;
    color: #bb0000;
    background-color: #fff7f7
}

.imprint {
    margin-top: 1ex;
    font-size: 80%;
    color: #666666;
}

.imprinthead {
    font-weight: bolder;
    color: #666666;
}

.indexlink {
    text-align: right;
    padding-bottom: 5px;
}

.postscript {
    margin-top: 2ex;
    font-size: 80%;
    color: #666666
}

.evenrow {
    background-color: #e7e7ef;
    vertical-align: top;
}

.oddrow {
    background-color: #f7f7ff;
    vertical-align: top;
}

.headrow {
    background-color: #97979f;
    color: #ffffff;
    vertical-align: top;
}

.logorow {
    vertical-align: top;
}

.error {
    color: red;
}

.var {
    font-style: italic
}

.halconoperator {
    font-family: monospace, monospace;
}

span.operator {
    font-family: monospace, monospace;
}

span.procedure {
    font-family: monospace, monospace;
}

span.operation {
    font-family: monospace, monospace;
}

span.feature {
    font-family: Arial, Helvetica, Homerton, sans-serif;
}

ul {
    padding-left: 1.2em;
}

li.dot {
    list-style-type: square;
    color: #f28d26;
}

.breadcrumb {
    font-size: 80%;
    color: white;
    background-color: #062d64;
    margin-bottom: 20px;
    padding-left: 35px;
    padding-right: 35px;
    padding-bottom: 15px;
}

.webbar {
    font-size: 80%;
    background-color: #dddddd;
    margin-top: 0px;
    margin-left: -35px;
    margin-right: -35px;
    margin-bottom: 0px;
    padding-top: 5px;
    padding-left: 35px;
    padding-right: 35px;
    padding-bottom: 5px;
}

.footer {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    border-top: 1px dashed #f28d26;
    font-size: 80%;
    color: #666666;
    padding-bottom: 8px;
}

.footer .socialmedia a {
    padding-left: 7px;
}

.socialmedia {
    padding-top: 10px;
}

.copyright {
    margin-top: 19px;
}

.breadcrumb a {
    color: #ffffff;
    border-bottom: 1px solid white;
}

.breadcrumb a:link:hover,
.breadcrumb a:visited:hover {
    text-decoration: none;
    border-bottom: none;
}

.heading {
    margin-top: 1ex;
    font-size: 110%;
    font-weight: bold;
    color: #666666;
}

.text {
    color: black;
}

.example {
    font-size: 80%;
    background-color: #f3f3f3;
    border: 1px dashed #666666;
    padding: 10px;
}

.displaymath {
    display: block;
    text-align: center;
    margin-top: 1ex;
    margin-bottom: 1ex;
}

.title {
    float: left;
    padding-top: 3px;
    padding-bottom: 3px;
}

.signnote {
    font-family: Arial, Helvetica, Homerton, sans-serif;
    font-size: 80%;
    color: #666666;
    font-weight: lighter;
    font-style: italic
}

.par {
    margin-bottom: 1.5em;
}

.parhead {
    text-align: right;
}

.parname {
    float: left;
}

.pardesc {
    font-size: 85%;
    margin-top: 0.5em;
    margin-bottom: 0.5em;
    margin-left: 2em;
}

.parcat {
    color: #666;
    font-weight: bold;
}

*[data-if=cpp],
*[data-if=c],
*[data-if=dotnet],
*[data-if=com],
*[data-if=python] {
    display: none;
}

.tabbar {
    text-align: right;
    border-bottom: 1px solid #f28d26;
    margin-bottom: 0.5em;
}

ul.tabs {
    padding-top: 3px;
    padding-bottom: 3px;
    margin-top: 10px;
    margin-bottom: 0;
    font-size: 80%
}

ul.tabs li {
    padding-top: 3px;
    padding-bottom: 3px;
    display: inline;
    overflow: hidden;
    list-style-type: none;
    margin: 0;
    margin-left: 8px;
    border-top: 1px solid #666;
    border-left: 1px solid #666;
    border-right: 1px solid #666;
}

ul.tabs li.active {
    border-left: 1px solid #f28d26;
    border-right: 1px solid #f28d26;
    border-top: 1px solid #f28d26;
    border-bottom: 1px solid #fff;
}

ul.tabs li.inactive {
    background-color: #eee;
}

ul.tabs li a {
    padding-left: 5px;
    padding-right: 5px;
    color: #666;
}

ul.tabs li a:link:hover {
    text-decoration: none;
}

ul.tabs li.inactive a {
    color: #666;
}

ul.tabs li.active a {
    color: black;
}

dl.generic dd {
    margin-bottom: 1em;
}

.pari {
    color: olive;
}

.paro {
    color: maroon;
}

.comment {
    font-size: 80%;
    color: green;
    white-space: nowrap;
}

table.grid {
    border-collapse: collapse;
}

table.grid td {
    padding: 5px;
    border: 1px solid;
}

table.layout {
    border: 0px;
}

table.layout td {
    padding: 5px;
}

table.table {
    border-collapse: collapse;
}

table.table td {
    padding: 5px;
    border-left: 0px;
    border-right: 0px;
}

table.table tr:last-child {
    border-bottom: 1px solid;
}

table.table th {
    padding: 5px;
    border-top: 1px solid;
    border-bottom: 1px solid;
    border-left: 0px;
    border-right: 0px;
}

.details_summary {
    cursor: pointer;
}

table.toctable {
    width: 100%;
}

table.toctable col:first-child {
    width: 20%;
}

table.toctable col:nth-last-child(2) {
    width: 8%;
}

table.altcolored tr:nth-child(even) {
    background-color: #f3f3f3;
}

    </style>
<!--OP_REF_STYLE_END-->
<script>
    <!--
var active_lang='hdevelop';function switchVisibility(obj,active_lang,new_lang)
{var display_style='inline';
for(var i=0;i<obj.length;i++)
{if(obj.item(i).getAttribute('data-if')==new_lang)
{obj.item(i).style.display=display_style;}
if(obj.item(i).getAttribute('data-if')==active_lang)
{obj.item(i).style.display='none';}}
return;}
function toggleLanguage(new_lang,initial)
{if(active_lang!=new_lang)
{var lis=document.getElementsByTagName('li');for(var i=0;i<lis.length;i++)
{if(lis.item(i).id=='syn-'+new_lang)
{lis.item(i).className='active';}
else
{lis.item(i).className='inactive';}}
var divs=document.getElementsByTagName('div');var spans=document.getElementsByTagName('span');switchVisibility(divs,active_lang,new_lang);switchVisibility(spans,active_lang,new_lang);if(!initial)
{setCookie("halcon_reference_language",new_lang,null,null);}
active_lang=new_lang;}
return;}
function setCookie(name,value,domain,exp_offset,path,secure)
{localStorage.setItem(name,value);}
function getCookie(name)
{return localStorage.getItem(name);}
function initialize()
{var qs=location.href.split('?')[1];var qs_lang_raw=location.href.split('interface=')[1];var qs_lang;if(qs_lang_raw)
{qs_lang=qs_lang_raw.split('#')[0];}
var cookie_lang=getCookie("halcon_reference_language");var new_lang;if((qs_lang=="hdevelop")||(qs_lang=="dotnet")||(qs_lang=="python")||(qs_lang=="cpp")||(qs_lang=="c"))
{new_lang=qs_lang;setCookie("halcon_reference_language",new_lang,null,null);}
else if((cookie_lang=="hdevelop")||(cookie_lang=="dotnet")||(cookie_lang=="python")||(cookie_lang=="cpp")||(cookie_lang=="c"))
{new_lang=cookie_lang;}
else
{new_lang="hdevelop";}
toggleLanguage(new_lang,1);return;}
-->

  </script>
</head>
<body onload="initialize();">
<div class="breadcrumb">
<br class="inv"><a href="index.html">目录</a> / <a href="toc_xld.html">XLD</a> / <a href="toc_xld_features.html">特征</a><br class="inv">
</div>
<div class="body_main">
<div class="tabbar"><ul class="tabs">
<li id="syn-hdevelop" class="active"><a href="javascript:void(0);" onclick="toggleLanguage('hdevelop')" onfocus="blur()">HDevelop</a></li>
<li id="syn-dotnet" class="inactive"><a href="javascript:void(0);" onclick="toggleLanguage('dotnet')" onfocus="blur()">.NET</a></li>
<li id="syn-python" class="inactive"><a href="javascript:void(0);" onclick="toggleLanguage('python')" onfocus="blur()">Python</a></li>
<li id="syn-cpp" class="inactive"><a href="javascript:void(0);" onclick="toggleLanguage('cpp')" onfocus="blur()">C++</a></li>
<li id="syn-c" class="inactive"><a href="javascript:void(0);" onclick="toggleLanguage('c')" onfocus="blur()">C</a></li>
</ul></div>
<div class="indexlink">
<a href="index_classes.html"><span data-if="dotnet" style="display:none;">类别</span><span data-if="cpp" style="display:none;">类别</span></a><span data-if="dotnet" style="display:none;"> | </span><span data-if="cpp" style="display:none;"> | </span><a href="index_by_name.html">算子列表</a>
</div>
<!--OP_REF_HEADER_END-->
<h1 id="sec_name">
<span data-if="hdevelop" style="display:inline;">area_center_xld</span><span data-if="c" style="display:none;">area_center_xld</span><span data-if="cpp" style="display:none;">AreaCenterXld</span><span data-if="dotnet" style="display:none;">AreaCenterXld</span><span data-if="python" style="display:none;">area_center_xld</span> (算子名称)</h1>
<h2>名称</h2>
<p><code><span data-if="hdevelop" style="display:inline;">area_center_xld</span><span data-if="c" style="display:none;">area_center_xld</span><span data-if="cpp" style="display:none;">AreaCenterXld</span><span data-if="dotnet" style="display:none;">AreaCenterXld</span><span data-if="python" style="display:none;">area_center_xld</span></code> — Area and center of gravity (centroid) of contours and polygons.</p>
<h2 id="sec_synopsis">参数签名</h2>
<div data-if="hdevelop" style="display:inline;">
<p>
<code><b>area_center_xld</b>(<a href="#XLD"><i>XLD</i></a> :  :  : <a href="#Area"><i>Area</i></a>, <a href="#Row"><i>Row</i></a>, <a href="#Column"><i>Column</i></a>, <a href="#PointOrder"><i>PointOrder</i></a>)</code></p>
</div>
<div data-if="c" style="display:none;">
<p>
<code>Herror <b>area_center_xld</b>(const Hobject <a href="#XLD"><i>XLD</i></a>, double* <a href="#Area"><i>Area</i></a>, double* <a href="#Row"><i>Row</i></a>, double* <a href="#Column"><i>Column</i></a>, char* <a href="#PointOrder"><i>PointOrder</i></a>)</code></p>
<p>
<code>Herror <b>T_area_center_xld</b>(const Hobject <a href="#XLD"><i>XLD</i></a>, Htuple* <a href="#Area"><i>Area</i></a>, Htuple* <a href="#Row"><i>Row</i></a>, Htuple* <a href="#Column"><i>Column</i></a>, Htuple* <a href="#PointOrder"><i>PointOrder</i></a>)</code></p>
</div>
<div data-if="cpp" style="display:none;">
<p>
<code>void <b>AreaCenterXld</b>(const HObject&amp; <a href="#XLD"><i>XLD</i></a>, HTuple* <a href="#Area"><i>Area</i></a>, HTuple* <a href="#Row"><i>Row</i></a>, HTuple* <a href="#Column"><i>Column</i></a>, HTuple* <a href="#PointOrder"><i>PointOrder</i></a>)</code></p>
<p>
<code><a href="HTuple.html">HTuple</a> <a href="HXLD.html">HXLD</a>::<b>AreaCenterXld</b>(HTuple* <a href="#Row"><i>Row</i></a>, HTuple* <a href="#Column"><i>Column</i></a>, HTuple* <a href="#PointOrder"><i>PointOrder</i></a>) const</code></p>
<p>
<code>double <a href="HXLD.html">HXLD</a>::<b>AreaCenterXld</b>(double* <a href="#Row"><i>Row</i></a>, double* <a href="#Column"><i>Column</i></a>, HString* <a href="#PointOrder"><i>PointOrder</i></a>) const</code></p>
</div>
<div data-if="com" style="display:none;"></div>
<div data-if="dotnet" style="display:none;">
<p>
<code>static void <a href="HOperatorSet.html">HOperatorSet</a>.<b>AreaCenterXld</b>(<a href="HObject.html">HObject</a> <a href="#XLD"><i>XLD</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#Area"><i>area</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#Row"><i>row</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#Column"><i>column</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#PointOrder"><i>pointOrder</i></a>)</code></p>
<p>
<code><a href="HTuple.html">HTuple</a> <a href="HXLD.html">HXLD</a>.<b>AreaCenterXld</b>(out <a href="HTuple.html">HTuple</a> <a href="#Row"><i>row</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#Column"><i>column</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#PointOrder"><i>pointOrder</i></a>)</code></p>
<p>
<code>double <a href="HXLD.html">HXLD</a>.<b>AreaCenterXld</b>(out double <a href="#Row"><i>row</i></a>, out double <a href="#Column"><i>column</i></a>, out string <a href="#PointOrder"><i>pointOrder</i></a>)</code></p>
</div>
<div data-if="python" style="display:none;">
<p>
<code>def <b>area_center_xld</b>(<a href="#XLD"><i>xld</i></a>: HObject) -&gt; Tuple[Sequence[float], Sequence[float], Sequence[float], Sequence[str]]</code></p>
<p>
<code>def <b>area_center_xld_s</b>(<a href="#XLD"><i>xld</i></a>: HObject) -&gt; Tuple[float, float, float, str]</code></p>
</div>
<h2 id="sec_description">描述</h2>
<p><code><span data-if="hdevelop" style="display:inline">area_center_xld</span><span data-if="c" style="display:none">area_center_xld</span><span data-if="cpp" style="display:none">AreaCenterXld</span><span data-if="com" style="display:none">AreaCenterXld</span><span data-if="dotnet" style="display:none">AreaCenterXld</span><span data-if="python" style="display:none">area_center_xld</span></code> calculates the area and center of gravity
(centroid) of the regions enclosed by the contours or polygons
<a href="#XLD"><i><code><span data-if="hdevelop" style="display:inline">XLD</span><span data-if="c" style="display:none">XLD</span><span data-if="cpp" style="display:none">XLD</span><span data-if="com" style="display:none">XLD</span><span data-if="dotnet" style="display:none">XLD</span><span data-if="python" style="display:none">xld</span></code></i></a> as well as the order of the points along the
boundary.  The area and centroid are computed by applying Green's
theorem using only the points on the contour or polygon, i.e., no
region is generated explicitly for the purpose of calculating the
features.  If the points are arranged counterclockwise (i.e., in a
positive mathematical sense) in the contour or polygon, <a href="#PointOrder"><i><code><span data-if="hdevelop" style="display:inline">PointOrder</span><span data-if="c" style="display:none">PointOrder</span><span data-if="cpp" style="display:none">PointOrder</span><span data-if="com" style="display:none">PointOrder</span><span data-if="dotnet" style="display:none">pointOrder</span><span data-if="python" style="display:none">point_order</span></code></i></a>
will be <i><span data-if="hdevelop" style="display:inline">'positive'</span><span data-if="c" style="display:none">"positive"</span><span data-if="cpp" style="display:none">"positive"</span><span data-if="com" style="display:none">"positive"</span><span data-if="dotnet" style="display:none">"positive"</span><span data-if="python" style="display:none">"positive"</span></i>.  It is assumed that the contours or
polygons are closed.  If this is not the case
<code><span data-if="hdevelop" style="display:inline">area_center_xld</span><span data-if="c" style="display:none">area_center_xld</span><span data-if="cpp" style="display:none">AreaCenterXld</span><span data-if="com" style="display:none">AreaCenterXld</span><span data-if="dotnet" style="display:none">AreaCenterXld</span><span data-if="python" style="display:none">area_center_xld</span></code> will artificially close the contour respectively
polygon.
</p>
<p>It should be noted that <code><span data-if="hdevelop" style="display:inline">area_center_xld</span><span data-if="c" style="display:none">area_center_xld</span><span data-if="cpp" style="display:none">AreaCenterXld</span><span data-if="com" style="display:none">AreaCenterXld</span><span data-if="dotnet" style="display:none">AreaCenterXld</span><span data-if="python" style="display:none">area_center_xld</span></code> only returns useful
results if the contour or polygon encloses a region in the plane.  In
particular, the contour or polygon must not intersect itself.  This
is particularly important if open contours or polygons are passed
because they are closed automatically, which can produce a
self-intersection. To test whether the contours or polygons
intersect themselves, <a href="test_self_intersection_xld.html"><code><span data-if="hdevelop" style="display:inline">test_self_intersection_xld</span><span data-if="c" style="display:none">test_self_intersection_xld</span><span data-if="cpp" style="display:none">TestSelfIntersectionXld</span><span data-if="com" style="display:none">TestSelfIntersectionXld</span><span data-if="dotnet" style="display:none">TestSelfIntersectionXld</span><span data-if="python" style="display:none">test_self_intersection_xld</span></code></a> can be
used.  If the contour or polygon intersects itself, a useful value
for the center of gravity can be calculated with
<a href="area_center_points_xld.html"><code><span data-if="hdevelop" style="display:inline">area_center_points_xld</span><span data-if="c" style="display:none">area_center_points_xld</span><span data-if="cpp" style="display:none">AreaCenterPointsXld</span><span data-if="com" style="display:none">AreaCenterPointsXld</span><span data-if="dotnet" style="display:none">AreaCenterPointsXld</span><span data-if="python" style="display:none">area_center_points_xld</span></code></a>.
</p>
<p>If more than one contour or polygon is passed, the results are stored
in tuples in the same order as the respective contours or polygons in
<a href="#XLD"><i><code><span data-if="hdevelop" style="display:inline">XLD</span><span data-if="c" style="display:none">XLD</span><span data-if="cpp" style="display:none">XLD</span><span data-if="com" style="display:none">XLD</span><span data-if="dotnet" style="display:none">XLD</span><span data-if="python" style="display:none">xld</span></code></i></a>.</p>
<h2 id="sec_execution">运行信息</h2>
<ul>
  <li>多线程类型:可重入(与非独占操作符并行运行)。</li>
<li>多线程作用域:全局(可以从任何线程调用)。</li>
  
    <li>在元组级别自动并行化。</li>
  
</ul>
<h2 id="sec_parameters">参数表</h2>
  <div class="par">
<div class="parhead">
<span id="XLD" class="parname"><b><code><span data-if="hdevelop" style="display:inline">XLD</span><span data-if="c" style="display:none">XLD</span><span data-if="cpp" style="display:none">XLD</span><span data-if="com" style="display:none">XLD</span><span data-if="dotnet" style="display:none">XLD</span><span data-if="python" style="display:none">xld</span></code></b> (input_object)  </span><span>xld(-array) <code>→</code> <span data-if="hdevelop" style="display:inline">object</span><span data-if="dotnet" style="display:none"><a href="HXLD.html">HXLD</a></span><span data-if="python" style="display:none">HObject</span><span data-if="cpp" style="display:none"><a href="HXLD.html">HXLD</a></span><span data-if="c" style="display:none">Hobject</span></span>
</div>
<p class="pardesc">Contours or polygons to be examined.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="Area" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Area</span><span data-if="c" style="display:none">Area</span><span data-if="cpp" style="display:none">Area</span><span data-if="com" style="display:none">Area</span><span data-if="dotnet" style="display:none">area</span><span data-if="python" style="display:none">area</span></code></b> (output_control)  </span><span>real(-array) <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[float]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (real)</span><span data-if="dotnet" style="display:none"> (<i>double</i>)</span><span data-if="cpp" style="display:none"> (<i>double</i>)</span><span data-if="c" style="display:none"> (<i>double</i>)</span></span>
</div>
<p class="pardesc">Area enclosed by the contour or polygon.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="Row" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Row</span><span data-if="c" style="display:none">Row</span><span data-if="cpp" style="display:none">Row</span><span data-if="com" style="display:none">Row</span><span data-if="dotnet" style="display:none">row</span><span data-if="python" style="display:none">row</span></code></b> (output_control)  </span><span>point.y(-array) <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[float]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (real)</span><span data-if="dotnet" style="display:none"> (<i>double</i>)</span><span data-if="cpp" style="display:none"> (<i>double</i>)</span><span data-if="c" style="display:none"> (<i>double</i>)</span></span>
</div>
<p class="pardesc">Row coordinate of the centroid.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="Column" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Column</span><span data-if="c" style="display:none">Column</span><span data-if="cpp" style="display:none">Column</span><span data-if="com" style="display:none">Column</span><span data-if="dotnet" style="display:none">column</span><span data-if="python" style="display:none">column</span></code></b> (output_control)  </span><span>point.x(-array) <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[float]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (real)</span><span data-if="dotnet" style="display:none"> (<i>double</i>)</span><span data-if="cpp" style="display:none"> (<i>double</i>)</span><span data-if="c" style="display:none"> (<i>double</i>)</span></span>
</div>
<p class="pardesc">Column coordinate of the centroid.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="PointOrder" class="parname"><b><code><span data-if="hdevelop" style="display:inline">PointOrder</span><span data-if="c" style="display:none">PointOrder</span><span data-if="cpp" style="display:none">PointOrder</span><span data-if="com" style="display:none">PointOrder</span><span data-if="dotnet" style="display:none">pointOrder</span><span data-if="python" style="display:none">point_order</span></code></b> (output_control)  </span><span>string(-array) <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[str]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (string)</span><span data-if="dotnet" style="display:none"> (<i>string</i>)</span><span data-if="cpp" style="display:none"> (<i>HString</i>)</span><span data-if="c" style="display:none"> (<i>char*</i>)</span></span>
</div>
<p class="pardesc">point order along the boundary
('positive'/'negative').</p>
</div>
<h2 id="sec_complexity">Complexity</h2>
<p>Let n be the number of points of the contour or polygon.
Then the run time is O(n).</p>
<h2 id="sec_result">结果</h2>
<p><code><span data-if="hdevelop" style="display:inline">area_center_xld</span><span data-if="c" style="display:none">area_center_xld</span><span data-if="cpp" style="display:none">AreaCenterXld</span><span data-if="com" style="display:none">AreaCenterXld</span><span data-if="dotnet" style="display:none">AreaCenterXld</span><span data-if="python" style="display:none">area_center_xld</span></code> returns <TT>2</TT> (
      <TT>H_MSG_TRUE</TT>)
     if the input is not empty.
If the input is empty the behavior can be set via
<a href="set_system.html"><code><span data-if="hdevelop" style="display:inline">set_system(::'no_object_result',&lt;Result&gt;:)</span><span data-if="c" style="display:none">set_system("no_object_result",&lt;Result&gt;)</span><span data-if="cpp" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="com" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="dotnet" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="python" style="display:none">set_system("no_object_result",&lt;Result&gt;)</span></code></a>.  If
necessary, an exception is raised.</p>
<h2 id="sec_predecessors">可能的前置算子</h2>
<p>
<code><a href="gen_contours_skeleton_xld.html"><span data-if="hdevelop" style="display:inline">gen_contours_skeleton_xld</span><span data-if="c" style="display:none">gen_contours_skeleton_xld</span><span data-if="cpp" style="display:none">GenContoursSkeletonXld</span><span data-if="com" style="display:none">GenContoursSkeletonXld</span><span data-if="dotnet" style="display:none">GenContoursSkeletonXld</span><span data-if="python" style="display:none">gen_contours_skeleton_xld</span></a></code>, 
<code><a href="smooth_contours_xld.html"><span data-if="hdevelop" style="display:inline">smooth_contours_xld</span><span data-if="c" style="display:none">smooth_contours_xld</span><span data-if="cpp" style="display:none">SmoothContoursXld</span><span data-if="com" style="display:none">SmoothContoursXld</span><span data-if="dotnet" style="display:none">SmoothContoursXld</span><span data-if="python" style="display:none">smooth_contours_xld</span></a></code>, 
<code><a href="gen_polygons_xld.html"><span data-if="hdevelop" style="display:inline">gen_polygons_xld</span><span data-if="c" style="display:none">gen_polygons_xld</span><span data-if="cpp" style="display:none">GenPolygonsXld</span><span data-if="com" style="display:none">GenPolygonsXld</span><span data-if="dotnet" style="display:none">GenPolygonsXld</span><span data-if="python" style="display:none">gen_polygons_xld</span></a></code>
</p>
<h2 id="sec_alternatives">可替代算子</h2>
<p>
<code><a href="area_center_points_xld.html"><span data-if="hdevelop" style="display:inline">area_center_points_xld</span><span data-if="c" style="display:none">area_center_points_xld</span><span data-if="cpp" style="display:none">AreaCenterPointsXld</span><span data-if="com" style="display:none">AreaCenterPointsXld</span><span data-if="dotnet" style="display:none">AreaCenterPointsXld</span><span data-if="python" style="display:none">area_center_points_xld</span></a></code>
</p>
<h2 id="sec_see">参考其它</h2>
<p>
<code><a href="moments_xld.html"><span data-if="hdevelop" style="display:inline">moments_xld</span><span data-if="c" style="display:none">moments_xld</span><span data-if="cpp" style="display:none">MomentsXld</span><span data-if="com" style="display:none">MomentsXld</span><span data-if="dotnet" style="display:none">MomentsXld</span><span data-if="python" style="display:none">moments_xld</span></a></code>, 
<code><a href="moments_any_xld.html"><span data-if="hdevelop" style="display:inline">moments_any_xld</span><span data-if="c" style="display:none">moments_any_xld</span><span data-if="cpp" style="display:none">MomentsAnyXld</span><span data-if="com" style="display:none">MomentsAnyXld</span><span data-if="dotnet" style="display:none">MomentsAnyXld</span><span data-if="python" style="display:none">moments_any_xld</span></a></code>, 
<code><a href="area_center.html"><span data-if="hdevelop" style="display:inline">area_center</span><span data-if="c" style="display:none">area_center</span><span data-if="cpp" style="display:none">AreaCenter</span><span data-if="com" style="display:none">AreaCenter</span><span data-if="dotnet" style="display:none">AreaCenter</span><span data-if="python" style="display:none">area_center</span></a></code>, 
<code><a href="moments_region_2nd.html"><span data-if="hdevelop" style="display:inline">moments_region_2nd</span><span data-if="c" style="display:none">moments_region_2nd</span><span data-if="cpp" style="display:none">MomentsRegion2nd</span><span data-if="com" style="display:none">MomentsRegion2nd</span><span data-if="dotnet" style="display:none">MomentsRegion2nd</span><span data-if="python" style="display:none">moments_region_2nd</span></a></code>
</p>
<h2 id="sec_module">模块</h2>
<p>
Foundation</p>
<!--OP_REF_FOOTER_START-->
<hr>
<div class="indexlink">
<a href="index_classes.html"><span data-if="dotnet" style="display:none;">类别</span><span data-if="cpp" style="display:none;">类别</span></a><span data-if="dotnet" style="display:none;"> | </span><span data-if="cpp" style="display:none;"> | </span><a href="index_by_name.html">算子列表</a>
</div>
<div class="footer">
<div class="copyright">HALCON算子参考手册 Copyright © 2015-2023 51Halcon</div>
</div>
</div>
</body>
</html>
